"TSA ID checker?" Do you mean the private contractor who IS paid by the hour to check your ID and boarding pass at the checkpoint entrance?

As for the airlines calling you back to the counter, good for you! I wish more airlines would do that. Unfortunately, they seem to not bother with it in the face of common sense. What you have to understand is that even a lot of us TSA screeners are skeptical about the SSSS system, especially when we see very stupid applications of it.

Examples: elderly and frail passengers, wheelchair bound passengers, military personnel in uniform on official travel orders, airline pilots, infants, children and, my all time favorite....musical instruments!!! (At the risk of being redundantly repetitive, a passenger had to purchase an extra ticket for the seat to accomodate his cello which he took as a carry-on. His ticket was "clear," but the one for the cello had SSSS on it!)

My point here is that the airlines CAN adjust boarding passes whenever the computer automatically tags someone for additional screening. Once you're at our checkpoint, however, our hands are pretty much tied. (We can only "de-select" children under 12.)